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w załączniku
Zad 11
ramię trapezu: x+11-x-3=8
8/2=4
ramię:5
Obw.=2*5+x+3+x+11=10+14+2x=24+2x
24+2x=54
2x=30
x=15
P=1/2(15+3+15+11)3=22*3=66